Firstly you take pentop tab before meal for bloating
secodly increse calcium intake like a cup of milk fruits rich in iron calcium
do regular exercise
and lastly irregular periods
are very common in early age and a variation or 3-5days are normal in cycle there is nothing to be upset
do walk for 30-40mints regulary drink lot of water and take syrup siocare 10ml for 3cycles you will be fine.